docs: def is_command_callable(command, name=""):
      """
      Check if command can be called.
  
      :param str command: actual command to call
      :param str name: nickname/alias by which to reference the command, optional
      :return bool: whether given command's call succeeded
      """
  
      # Use `command` to see if command is callable, store exit code
      code = os.system(
          "command -v {0} >/dev/null 2>&1 || {{ exit 1; }}".format(command))
  
      if code != 0:
          alias_value = " ('{}') ".format(name) if name else " "
          _LOGGER.debug("Command '{0}' is not callable: {1}".
                        format(alias_value, command))
      return not bool(code)